Couldn't pass blue line threshold into boss arena in Temple of the Fist

[Oangusa]

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Date & Time: 07/20/17 at 4:10 PM EDT . Dungeon started at around 4:05 PM EDT
Frequency: for the duration of my time in the dungeon
World name: Zalera, but in the dungeon Temple of the First
Character name: Gwyn Lionhart
Monster name: Coeurl Smriti
Class/Level: PLD/70
Party or solo: Party
In-game time: (9ish ET)
Area and coordinates: Temple of the Fist, Tourmaline Pond
Steps:
1. Tried to run into the arena Tourmaline Pond to start the fight with the first dungeon boss
2. Unable to cross the blue/purple line that marked the threshold to the arena
3. Other players could cross the blue line with no issue
3. Healer tried using Rescue when in combat but it said I dodged it.
4. Healer stood on the blue/purple line until the arena was sealed and instead of pushing him in or out it killed him.
5. Tried logging in/out but still couldn't cross the line.


Edit: Happened again with another dungeon, Sohm Al HM. Couldn't enter the first boss's arena. I'm not sure if related, but I can't enter instanced rooms like the Squadron or Rising Stones, either. There's no glowing blue orb at the door for me to interact with in either case.